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97 cavalier

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gbrough
Novice

Jun 11, 2009, 4:59 PM

Post #1 of 5 (4496 views)
97 cavalier Sign In
My daughter has a 97 Cavalier z24 with a 2.4 double overhead cam motor. Has about 100,000 miles. It is running rough setting p0301 and p0420 codes. p0310 is cyl 1 misfire and po420 is catalyst efficiency threashold bank 1. I checked spark coming from the coils, that seemed ok. Pulled the number 1 plug and it was slightly fouled. Do not know what the po420 code means.
Any ideas? Please help she really needs this car.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 11, 2009, 5:15 PM

Post #2 of 5 (4488 views)
Re: 97 cavalier Sign In
Thye PO420 is pretty cut and dry. It's a bad cat on bank 1. It has to meet a lot of different criteria in order to set that code so it's hard for it to be anything else.

On the misfires, the common problem on these is the white plastic coil housing. On this engine it acts as a distributor cap and they cause misfires all the time.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



gbrough
Novice

Jun 12, 2009, 1:20 PM

Post #3 of 5 (4477 views)
Re: 97 cavalier Sign In
Thanks the white cap is cracked however all the plugs are firing. (I removed the cover and turned it over.) Should I still replace the coil assembly.
Sorry but i do not know what a bad cat on bank 1 is.
Thanks for your help.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 12, 2009, 1:44 PM

Post #4 of 5 (4472 views)
Re: 97 cavalier Sign In
Bad cat means you have a bad catalytic converter. The bank number isn't important because you only have one.

I don't know what you turned over but what I told you to replace is the white plastic coil housing (#4 in the picture) and the plug boots.






~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



gbrough
Novice

Jun 17, 2009, 10:54 AM

Post #5 of 5 (4451 views)
Re: 97 cavalier Sign In
Thanks a lot for your help. I replaced the coil and moduel and the car runs like new! Thanks again gerry





 
 
 






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